Question

Zen priest-painters used a painting technique called haboku, "splashed ink," as a metaphor to express:

Answer 1

Sudden enlightenment is the answer in this question. This statement used as a metaphor to express the sudden enlightenment, the Zen priest-painters used a painting technique which they called haboku a splashed ink. In short the thing they called haboku used as a metaphor to express sudden enlightenment.